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math.SP2008
Absence of eigenvalues for integro-differential operators with periodic coefficients
Marius Marinel Stanescu, Igor Cialenco
Applying perturbation theory methods, the absence of the point spectrum for some nonselfadjoint integro-differential operators is investigated. The considered differential operator…
math.SP2007
On the point spectrum of some perturbed differential operators with periodic coefficients
Igor Cialenco
Finiteness of the point spectrum of linear operators acting in a Banach space is investigated from point of view of perturbation theory. In the first part of the paper we present a…